Jorn Olsen took the pictures and works for the Dutton-Lainson Co. in Hastings,
Nebraska, and lives by Heartwell Park next to Hastings College.
The stadium lights are at the Hastings College stadium
just east of his home.
The clouds are called Mammatus clouds. They do not
precede a tornado, or foretell a storm, but are formed
when the air is already saturated with rain droplets
and/or ice crystals and begins to sink. The worst of the
storm is usually over when these kind of clouds are seen.
They are quite rare, but really beautiful.

Those are called "mammatocumulus", cumulus because they are dense, white, fluffy clouds with a flat base, a multiple rounded top, and a well-defined outline. Mammatus cause it comes from latin mammarius, meaning breasts.

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